Transaction Hash:
Block:
15532352 at Sep-14-2022 10:12:39 AM +UTC
Transaction Fee:
0.002912190543860868 ETH
$7.11
Gas Used:
394,164 Gas / 7.388271237 Gwei
Emitted Events:
| 339 |
UniswapV2Pair.Transfer( from=[Sender] 0xf295d7a912145c9616d853c165b18cc7e8ab8da6, to=[Receiver] UniswapV2Locker, value=306594194335116833 )
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| 340 |
UniswapV2Pair.Transfer( from=[Receiver] UniswapV2Locker, to=0x04bDa42de3bc32Abb00df46004204424d4Cf8287, value=3065941943351168 )
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| 341 |
UniswapV2Locker.onDeposit( lpToken=UniswapV2Pair, user=[Sender] 0xf295d7a912145c9616d853c165b18cc7e8ab8da6, amount=303528252391765665, lockDate=1663150359, unlockDate=1670904000 )
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Account State Difference:
| Address | Before | After | State Difference | ||
|---|---|---|---|---|---|
| 0x04bDa42d...4d4Cf8287 | 3.297789379962786082 Eth | 3.377789379962786082 Eth | 0.08 | ||
| 0x663A5C22...8Eb9db214 | (UNCX Network Security : LP Lockers) | ||||
|
0x6EBaF477...D8C9B131a
Miner
| (Miner: 0x6eb...31a) | 212.487234034089629448 Eth | 212.488022362089629448 Eth | 0.000788328 | |
| 0x9115a4dc...8A38a746C | |||||
| 0xf295D7a9...7e8Ab8Da6 |
0.702141815407527164 Eth
Nonce: 5
|
0.619229624863666296 Eth
Nonce: 6
| 0.082912190543860868 |
Execution Trace
ETH 0.08
UniswapV2Locker.lockLPToken( _lpToken=0x9115a4dc728755F65c4BD0F81de46AB8A38a746C, _amount=306594194335116833, _unlock_date=1670904000, _referral=0x0000000000000000000000000000000000000000, _fee_in_eth=True, _withdrawer=0xf295D7a912145c9616D853c165B18cC7e8Ab8Da6 )
-
UniswapV2Pair.STATICCALL( )
-
UniswapV2Pair.STATICCALL( )
-
UniswapV2Factory.getPair( 0x3d7Fa8Fdeb893852202F6c1D0df624E06Ba63209, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 ) => ( 0x9115a4dc728755F65c4BD0F81de46AB8A38a746C ) -
UniswapV2Pair.transferFrom( from=0xf295D7a912145c9616D853c165B18cC7e8Ab8Da6, to=0x663A5C229c09b049E36dCc11a9B0d4a8Eb9db214, value=306594194335116833 ) => ( True )
- ETH 0.08
0x04bda42de3bc32abb00df46004204424d4cf8287.CALL( ) -
UniswapV2Pair.transfer( to=0x04bDa42de3bc32Abb00df46004204424d4Cf8287, value=3065941943351168 ) => ( True )
File 1 of 3: UniswapV2Locker
File 2 of 3: UniswapV2Pair
File 3 of 3: UniswapV2Factory
{"Context.sol":{"content":"// SPDX-License-Identifier: MIT\n\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/GSN/Context.sol\n// Subject to the MIT license.\n\npragma solidity \u003e=0.6.0 \u003c0.8.0;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address payable) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes memory) {\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n return msg.data;\n }\n}"},"EnumerableSet.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/EnumerableSet.sol\r\n// Subject to the MIT license.\r\n\r\npragma solidity \u003e=0.6.0 \u003c0.8.0;\r\n\r\n/**\r\n * @dev Library for managing\r\n * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive\r\n * types.\r\n *\r\n * Sets have the following properties:\r\n *\r\n * - Elements are added, removed, and checked for existence in constant time\r\n * (O(1)).\r\n * - Elements are enumerated in O(n). No guarantees are made on the ordering.\r\n *\r\n * ```\r\n * contract Example {\r\n * // Add the library methods\r\n * using EnumerableSet for EnumerableSet.AddressSet;\r\n *\r\n * // Declare a set state variable\r\n * EnumerableSet.AddressSet private mySet;\r\n * }\r\n * ```\r\n *\r\n * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)\r\n * and `uint256` (`UintSet`) are supported.\r\n */\r\nlibrary EnumerableSet {\r\n // To implement this library for multiple types with as little code\r\n // repetition as possible, we write it in terms of a generic Set type with\r\n // bytes32 values.\r\n // The Set implementation uses private functions, and user-facing\r\n // implementations (such as AddressSet) are just wrappers around the\r\n // underlying Set.\r\n // This means that we can only create new EnumerableSets for types that fit\r\n // in bytes32.\r\n\r\n struct Set {\r\n // Storage of set values\r\n bytes32[] _values;\r\n\r\n // Position of the value in the `values` array, plus 1 because index 0\r\n // means a value is not in the set.\r\n mapping (bytes32 =\u003e uint256) _indexes;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function _add(Set storage set, bytes32 value) private returns (bool) {\r\n if (!_contains(set, value)) {\r\n set._values.push(value);\r\n // The value is stored at length-1, but we add 1 to all indexes\r\n // and use 0 as a sentinel value\r\n set._indexes[value] = set._values.length;\r\n return true;\r\n } else {\r\n return false;\r\n }\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function _remove(Set storage set, bytes32 value) private returns (bool) {\r\n // We read and store the value\u0027s index to prevent multiple reads from the same storage slot\r\n uint256 valueIndex = set._indexes[value];\r\n\r\n if (valueIndex != 0) { // Equivalent to contains(set, value)\r\n // To delete an element from the _values array in O(1), we swap the element to delete with the last one in\r\n // the array, and then remove the last element (sometimes called as \u0027swap and pop\u0027).\r\n // This modifies the order of the array, as noted in {at}.\r\n\r\n uint256 toDeleteIndex = valueIndex - 1;\r\n uint256 lastIndex = set._values.length - 1;\r\n\r\n // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs\r\n // so rarely, we still do the swap anyway to avoid the gas cost of adding an \u0027if\u0027 statement.\r\n\r\n bytes32 lastvalue = set._values[lastIndex];\r\n\r\n // Move the last value to the index where the value to delete is\r\n set._values[toDeleteIndex] = lastvalue;\r\n // Update the index for the moved value\r\n set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based\r\n\r\n // Delete the slot where the moved value was stored\r\n set._values.pop();\r\n\r\n // Delete the index for the deleted slot\r\n delete set._indexes[value];\r\n\r\n return true;\r\n } else {\r\n return false;\r\n }\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function _contains(Set storage set, bytes32 value) private view returns (bool) {\r\n return set._indexes[value] != 0;\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values on the set. O(1).\r\n */\r\n function _length(Set storage set) private view returns (uint256) {\r\n return set._values.length;\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function _at(Set storage set, uint256 index) private view returns (bytes32) {\r\n require(set._values.length \u003e index, \"EnumerableSet: index out of bounds\");\r\n return set._values[index];\r\n }\r\n\r\n // Bytes32Set\r\n\r\n struct Bytes32Set {\r\n Set _inner;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {\r\n return _add(set._inner, value);\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {\r\n return _remove(set._inner, value);\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {\r\n return _contains(set._inner, value);\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values in the set. O(1).\r\n */\r\n function length(Bytes32Set storage set) internal view returns (uint256) {\r\n return _length(set._inner);\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {\r\n return _at(set._inner, index);\r\n }\r\n\r\n // AddressSet\r\n\r\n struct AddressSet {\r\n Set _inner;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function add(AddressSet storage set, address value) internal returns (bool) {\r\n return _add(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function remove(AddressSet storage set, address value) internal returns (bool) {\r\n return _remove(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function contains(AddressSet storage set, address value) internal view returns (bool) {\r\n return _contains(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values in the set. O(1).\r\n */\r\n function length(AddressSet storage set) internal view returns (uint256) {\r\n return _length(set._inner);\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function at(AddressSet storage set, uint256 index) internal view returns (address) {\r\n return address(uint256(_at(set._inner, index)));\r\n }\r\n\r\n\r\n // UintSet\r\n\r\n struct UintSet {\r\n Set _inner;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function add(UintSet storage set, uint256 value) internal returns (bool) {\r\n return _add(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function remove(UintSet storage set, uint256 value) internal returns (bool) {\r\n return _remove(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function contains(UintSet storage set, uint256 value) internal view returns (bool) {\r\n return _contains(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values on the set. O(1).\r\n */\r\n function length(UintSet storage set) internal view returns (uint256) {\r\n return _length(set._inner);\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function at(UintSet storage set, uint256 index) internal view returns (uint256) {\r\n return uint256(_at(set._inner, index));\r\n }\r\n}"},"Ownable.sol":{"content":"// SPDX-License-Identifier: MIT\n\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol\n// Subject to the MIT license.\n\npragma solidity \u003e=0.6.0 \u003c0.8.0;\n\nimport \"./Context.sol\";\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor () internal {\n address msgSender = _msgSender();\n _owner = msgSender;\n emit OwnershipTransferred(address(0), msgSender);\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n require(_owner == _msgSender(), \"Ownable: caller is not the owner\");\n _;\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n emit OwnershipTransferred(_owner, address(0));\n _owner = address(0);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n emit OwnershipTransferred(_owner, newOwner);\n _owner = newOwner;\n }\n}"},"ReentrancyGuard.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol\r\n// Subject to the MIT license.\r\n\r\npragma solidity \u003e=0.6.0 \u003c0.8.0;\r\n\r\n/**\r\n * @dev Contract module that helps prevent reentrant calls to a function.\r\n *\r\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\r\n * available, which can be applied to functions to make sure there are no nested\r\n * (reentrant) calls to them.\r\n *\r\n * Note that because there is a single `nonReentrant` guard, functions marked as\r\n * `nonReentrant` may not call one another. This can be worked around by making\r\n * those functions `private`, and then adding `external` `nonReentrant` entry\r\n * points to them.\r\n *\r\n * TIP: If you would like to learn more about reentrancy and alternative ways\r\n * to protect against it, check out our blog post\r\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\r\n */\r\nabstract contract ReentrancyGuard {\r\n // Booleans are more expensive than uint256 or any type that takes up a full\r\n // word because each write operation emits an extra SLOAD to first read the\r\n // slot\u0027s contents, replace the bits taken up by the boolean, and then write\r\n // back. This is the compiler\u0027s defense against contract upgrades and\r\n // pointer aliasing, and it cannot be disabled.\r\n\r\n // The values being non-zero value makes deployment a bit more expensive,\r\n // but in exchange the refund on every call to nonReentrant will be lower in\r\n // amount. Since refunds are capped to a percentage of the total\r\n // transaction\u0027s gas, it is best to keep them low in cases like this one, to\r\n // increase the likelihood of the full refund coming into effect.\r\n uint256 private constant _NOT_ENTERED = 1;\r\n uint256 private constant _ENTERED = 2;\r\n\r\n uint256 private _status;\r\n\r\n constructor () internal {\r\n _status = _NOT_ENTERED;\r\n }\r\n\r\n /**\r\n * @dev Prevents a contract from calling itself, directly or indirectly.\r\n * Calling a `nonReentrant` function from another `nonReentrant`\r\n * function is not supported. It is possible to prevent this from happening\r\n * by making the `nonReentrant` function external, and make it call a\r\n * `private` function that does the actual work.\r\n */\r\n modifier nonReentrant() {\r\n // On the first call to nonReentrant, _notEntered will be true\r\n require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\r\n\r\n // Any calls to nonReentrant after this point will fail\r\n _status = _ENTERED;\r\n\r\n _;\r\n\r\n // By storing the original value once again, a refund is triggered (see\r\n // https://eips.ethereum.org/EIPS/eip-2200)\r\n _status = _NOT_ENTERED;\r\n }\r\n}"},"SafeMath.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol\r\n// Subject to the MIT license.\r\n\r\npragma solidity \u003e=0.6.0 \u003c0.8.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it\u0027s recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n /**\r\n * @dev Returns the addition of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity\u0027s `+` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Addition cannot overflow.\r\n */\r\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n uint256 c = a + b;\r\n require(c \u003e= a, \"SafeMath: addition overflow\");\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting on\r\n * overflow (when the result is negative).\r\n *\r\n * Counterpart to Solidity\u0027s `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return sub(a, b, \"SafeMath: subtraction overflow\");\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n * overflow (when the result is negative).\r\n *\r\n * Counterpart to Solidity\u0027s `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b \u003c= a, errorMessage);\r\n uint256 c = a - b;\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the multiplication of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity\u0027s `*` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Multiplication cannot overflow.\r\n */\r\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\r\n // benefit is lost if \u0027b\u0027 is also tested.\r\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n if (a == 0) {\r\n return 0;\r\n }\r\n\r\n uint256 c = a * b;\r\n require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers. Reverts on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return div(a, b, \"SafeMath: division by zero\");\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b \u003e 0, errorMessage);\r\n uint256 c = a / b;\r\n // assert(a == b * c + a % b); // There is no case in which this doesn\u0027t hold\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * Reverts when dividing by zero.\r\n *\r\n * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return mod(a, b, \"SafeMath: modulo by zero\");\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * Reverts with custom message when dividing by zero.\r\n *\r\n * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b != 0, errorMessage);\r\n return a % b;\r\n }\r\n}"},"TransferHelper.sol":{"content":"pragma solidity 0.6.12;\r\n\r\n// helper methods for interacting with ERC20 tokens that do not consistently return true/false\r\nlibrary TransferHelper {\r\n function safeApprove(address token, address to, uint value) internal {\r\n (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));\r\n require(success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))), \u0027TransferHelper: APPROVE_FAILED\u0027);\r\n }\r\n\r\n function safeTransfer(address token, address to, uint value) internal {\r\n (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));\r\n require(success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))), \u0027TransferHelper: TRANSFER_FAILED\u0027);\r\n }\r\n\r\n function safeTransferFrom(address token, address from, address to, uint value) internal {\r\n (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));\r\n require(success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))), \u0027TransferHelper: TRANSFER_FROM_FAILED\u0027);\r\n }\r\n\r\n}"},"UniswapV2Locker.sol":{"content":"// SPDX-License-Identifier: UNLICENSED\r\n\r\n// This contract locks uniswap v2 liquidity tokens. Used to give investors peace of mind a token team has locked liquidity\r\n// and that the univ2 tokens cannot be removed from uniswap until the specified unlock date has been reached.\r\n\r\npragma solidity 0.6.12;\r\n\r\nimport \"./TransferHelper.sol\";\r\nimport \"./EnumerableSet.sol\";\r\nimport \"./SafeMath.sol\";\r\nimport \"./Ownable.sol\";\r\nimport \"./ReentrancyGuard.sol\";\r\n\r\ninterface IUniswapV2Pair {\r\n function factory() external view returns (address);\r\n function token0() external view returns (address);\r\n function token1() external view returns (address);\r\n}\r\n\r\ninterface IERCBurn {\r\n function burn(uint256 _amount) external;\r\n function approve(address spender, uint256 amount) external returns (bool);\r\n function allowance(address owner, address spender) external returns (uint256);\r\n function balanceOf(address account) external view returns (uint256);\r\n}\r\n\r\ninterface IUniFactory {\r\n function getPair(address tokenA, address tokenB) external view returns (address);\r\n}\r\n\r\ninterface IMigrator {\r\n function migrate(address lpToken, uint256 amount, uint256 unlockDate, address owner) external returns (bool);\r\n}\r\n\r\ncontract UniswapV2Locker is Ownable, ReentrancyGuard {\r\n using SafeMath for uint256;\r\n using EnumerableSet for EnumerableSet.AddressSet;\r\n\r\n IUniFactory public uniswapFactory;\r\n\r\n struct UserInfo {\r\n EnumerableSet.AddressSet lockedTokens; // records all tokens the user has locked\r\n mapping(address =\u003e uint256[]) locksForToken; // map erc20 address to lock id for that token\r\n }\r\n\r\n struct TokenLock {\r\n uint256 lockDate; // the date the token was locked\r\n uint256 amount; // the amount of tokens still locked (initialAmount minus withdrawls)\r\n uint256 initialAmount; // the initial lock amount\r\n uint256 unlockDate; // the date the token can be withdrawn\r\n uint256 lockID; // lockID nonce per uni pair\r\n address owner;\r\n }\r\n\r\n mapping(address =\u003e UserInfo) private users;\r\n\r\n EnumerableSet.AddressSet private lockedTokens;\r\n mapping(address =\u003e TokenLock[]) public tokenLocks; //map univ2 pair to all its locks\r\n \r\n struct FeeStruct {\r\n uint256 ethFee; // Small eth fee to prevent spam on the platform\r\n IERCBurn secondaryFeeToken; // UNCX or UNCL\r\n uint256 secondaryTokenFee; // optional, UNCX or UNCL\r\n uint256 secondaryTokenDiscount; // discount on liquidity fee for burning secondaryToken\r\n uint256 liquidityFee; // fee on univ2 liquidity tokens\r\n uint256 referralPercent; // fee for referrals\r\n IERCBurn referralToken; // token the refferer must hold to qualify as a referrer\r\n uint256 referralHold; // balance the referrer must hold to qualify as a referrer\r\n uint256 referralDiscount; // discount on flatrate fees for using a valid referral address\r\n }\r\n \r\n FeeStruct public gFees;\r\n EnumerableSet.AddressSet private feeWhitelist;\r\n \r\n address payable devaddr;\r\n \r\n IMigrator migrator;\r\n\r\n event onDeposit(address lpToken, address user, uint256 amount, uint256 lockDate, uint256 unlockDate);\r\n event onWithdraw(address lpToken, uint256 amount);\r\n\r\n constructor(IUniFactory _uniswapFactory) public {\r\n devaddr = msg.sender;\r\n gFees.referralPercent = 250; // 25%\r\n gFees.ethFee = 1e18;\r\n gFees.secondaryTokenFee = 100e18;\r\n gFees.secondaryTokenDiscount = 200; // 20%\r\n gFees.liquidityFee = 10; // 1%\r\n gFees.referralHold = 10e18;\r\n gFees.referralDiscount = 100; // 10%\r\n uniswapFactory = _uniswapFactory;\r\n }\r\n \r\n function setDev(address payable _devaddr) public onlyOwner {\r\n devaddr = _devaddr;\r\n }\r\n \r\n /**\r\n * @notice set the migrator contract which allows locked lp tokens to be migrated to uniswap v3\r\n */\r\n function setMigrator(IMigrator _migrator) public onlyOwner {\r\n migrator = _migrator;\r\n }\r\n \r\n function setSecondaryFeeToken(address _secondaryFeeToken) public onlyOwner {\r\n gFees.secondaryFeeToken = IERCBurn(_secondaryFeeToken);\r\n }\r\n \r\n /**\r\n * @notice referrers need to hold the specified token and hold amount to be elegible for referral fees\r\n */\r\n function setReferralTokenAndHold(IERCBurn _referralToken, uint256 _hold) public onlyOwner {\r\n gFees.referralToken = _referralToken;\r\n gFees.referralHold = _hold;\r\n }\r\n \r\n function setFees(uint256 _referralPercent, uint256 _referralDiscount, uint256 _ethFee, uint256 _secondaryTokenFee, uint256 _secondaryTokenDiscount, uint256 _liquidityFee) public onlyOwner {\r\n gFees.referralPercent = _referralPercent;\r\n gFees.referralDiscount = _referralDiscount;\r\n gFees.ethFee = _ethFee;\r\n gFees.secondaryTokenFee = _secondaryTokenFee;\r\n gFees.secondaryTokenDiscount = _secondaryTokenDiscount;\r\n gFees.liquidityFee = _liquidityFee;\r\n }\r\n \r\n /**\r\n * @notice whitelisted accounts dont pay flatrate fees on locking\r\n */\r\n function whitelistFeeAccount(address _user, bool _add) public onlyOwner {\r\n if (_add) {\r\n feeWhitelist.add(_user);\r\n } else {\r\n feeWhitelist.remove(_user);\r\n }\r\n }\r\n\r\n /**\r\n * @notice Creates a new lock\r\n * @param _lpToken the univ2 token address\r\n * @param _amount amount of LP tokens to lock\r\n * @param _unlock_date the unix timestamp (in seconds) until unlock\r\n * @param _referral the referrer address if any or address(0) for none\r\n * @param _fee_in_eth fees can be paid in eth or in a secondary token such as UNCX with a discount on univ2 tokens\r\n * @param _withdrawer the user who can withdraw liquidity once the lock expires.\r\n */\r\n function lockLPToken (address _lpToken, uint256 _amount, uint256 _unlock_date, address payable _referral, bool _fee_in_eth, address payable _withdrawer) external payable nonReentrant {\r\n require(_unlock_date \u003c 10000000000, \u0027TIMESTAMP INVALID\u0027); // prevents errors when timestamp entered in milliseconds\r\n require(_amount \u003e 0, \u0027INSUFFICIENT\u0027);\r\n\r\n // ensure this pair is a univ2 pair by querying the factory\r\n IUniswapV2Pair lpair = IUniswapV2Pair(address(_lpToken));\r\n address factoryPairAddress = uniswapFactory.getPair(lpair.token0(), lpair.token1());\r\n require(factoryPairAddress == address(_lpToken), \u0027NOT UNIV2\u0027);\r\n\r\n TransferHelper.safeTransferFrom(_lpToken, address(msg.sender), address(this), _amount);\r\n \r\n if (_referral != address(0) \u0026\u0026 address(gFees.referralToken) != address(0)) {\r\n require(gFees.referralToken.balanceOf(_referral) \u003e= gFees.referralHold, \u0027INADEQUATE BALANCE\u0027);\r\n }\r\n \r\n // flatrate fees\r\n if (!feeWhitelist.contains(msg.sender)) {\r\n if (_fee_in_eth) { // charge fee in eth\r\n uint256 ethFee = gFees.ethFee;\r\n if (_referral != address(0)) {\r\n ethFee = ethFee.mul(1000 - gFees.referralDiscount).div(1000);\r\n }\r\n require(msg.value == ethFee, \u0027FEE NOT MET\u0027);\r\n uint256 devFee = ethFee;\r\n if (ethFee != 0 \u0026\u0026 _referral != address(0)) { // referral fee\r\n uint256 referralFee = devFee.mul(gFees.referralPercent).div(1000);\r\n _referral.transfer(referralFee);\r\n devFee = devFee.sub(referralFee);\r\n }\r\n devaddr.transfer(devFee);\r\n } else { // charge fee in token\r\n uint256 burnFee = gFees.secondaryTokenFee;\r\n if (_referral != address(0)) {\r\n burnFee = burnFee.mul(1000 - gFees.referralDiscount).div(1000);\r\n }\r\n TransferHelper.safeTransferFrom(address(gFees.secondaryFeeToken), address(msg.sender), address(this), burnFee);\r\n if (gFees.referralPercent != 0 \u0026\u0026 _referral != address(0)) { // referral fee\r\n uint256 referralFee = burnFee.mul(gFees.referralPercent).div(1000);\r\n TransferHelper.safeApprove(address(gFees.secondaryFeeToken), _referral, referralFee);\r\n TransferHelper.safeTransfer(address(gFees.secondaryFeeToken), _referral, referralFee);\r\n burnFee = burnFee.sub(referralFee);\r\n }\r\n gFees.secondaryFeeToken.burn(burnFee);\r\n }\r\n } else if (msg.value \u003e 0){\r\n // refund eth if a whitelisted member sent it by mistake\r\n msg.sender.transfer(msg.value);\r\n }\r\n \r\n // percent fee\r\n uint256 liquidityFee = _amount.mul(gFees.liquidityFee).div(1000);\r\n if (!_fee_in_eth \u0026\u0026 !feeWhitelist.contains(msg.sender)) { // fee discount for large lockers using secondary token\r\n liquidityFee = liquidityFee.mul(1000 - gFees.secondaryTokenDiscount).div(1000);\r\n }\r\n TransferHelper.safeTransfer(_lpToken, devaddr, liquidityFee);\r\n uint256 amountLocked = _amount.sub(liquidityFee);\r\n\r\n TokenLock memory token_lock;\r\n token_lock.lockDate = block.timestamp;\r\n token_lock.amount = amountLocked;\r\n token_lock.initialAmount = amountLocked;\r\n token_lock.unlockDate = _unlock_date;\r\n token_lock.lockID = tokenLocks[_lpToken].length;\r\n token_lock.owner = _withdrawer;\r\n\r\n // record the lock for the univ2pair\r\n tokenLocks[_lpToken].push(token_lock);\r\n lockedTokens.add(_lpToken);\r\n\r\n // record the lock for the user\r\n UserInfo storage user = users[_withdrawer];\r\n user.lockedTokens.add(_lpToken);\r\n uint256[] storage user_locks = user.locksForToken[_lpToken];\r\n user_locks.push(token_lock.lockID);\r\n \r\n emit onDeposit(_lpToken, msg.sender, token_lock.amount, token_lock.lockDate, token_lock.unlockDate);\r\n }\r\n \r\n /**\r\n * @notice extend a lock with a new unlock date, _index and _lockID ensure the correct lock is changed\r\n * this prevents errors when a user performs multiple tx per block possibly with varying gas prices\r\n */\r\n function relock (address _lpToken, uint256 _index, uint256 _lockID, uint256 _unlock_date) external nonReentrant {\r\n require(_unlock_date \u003c 10000000000, \u0027TIMESTAMP INVALID\u0027); // prevents errors when timestamp entered in milliseconds\r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage userLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 userLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n require(userLock.unlockDate \u003c _unlock_date, \u0027UNLOCK BEFORE\u0027);\r\n \r\n uint256 liquidityFee = userLock.amount.mul(gFees.liquidityFee).div(1000);\r\n uint256 amountLocked = userLock.amount.sub(liquidityFee);\r\n \r\n userLock.amount = amountLocked;\r\n userLock.unlockDate = _unlock_date;\r\n\r\n // send univ2 fee to dev address\r\n TransferHelper.safeTransfer(_lpToken, devaddr, liquidityFee);\r\n }\r\n \r\n /**\r\n * @notice withdraw a specified amount from a lock. _index and _lockID ensure the correct lock is changed\r\n * this prevents errors when a user performs multiple tx per block possibly with varying gas prices\r\n */\r\n function withdraw (address _lpToken, uint256 _index, uint256 _lockID, uint256 _amount) external nonReentrant {\r\n require(_amount \u003e 0, \u0027ZERO WITHDRAWL\u0027);\r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage userLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 userLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n require(userLock.unlockDate \u003c block.timestamp, \u0027NOT YET\u0027);\r\n userLock.amount = userLock.amount.sub(_amount);\r\n \r\n // clean user storage\r\n if (userLock.amount == 0) {\r\n uint256[] storage userLocks = users[msg.sender].locksForToken[_lpToken];\r\n userLocks[_index] = userLocks[userLocks.length-1];\r\n userLocks.pop();\r\n if (userLocks.length == 0) {\r\n users[msg.sender].lockedTokens.remove(_lpToken);\r\n }\r\n }\r\n \r\n TransferHelper.safeTransfer(_lpToken, msg.sender, _amount);\r\n emit onWithdraw(_lpToken, _amount);\r\n }\r\n \r\n /**\r\n * @notice increase the amount of tokens per a specific lock, this is preferable to creating a new lock, less fees, and faster loading on our live block explorer\r\n */\r\n function incrementLock (address _lpToken, uint256 _index, uint256 _lockID, uint256 _amount) external nonReentrant {\r\n require(_amount \u003e 0, \u0027ZERO AMOUNT\u0027);\r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage userLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 userLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n \r\n TransferHelper.safeTransferFrom(_lpToken, address(msg.sender), address(this), _amount);\r\n \r\n // send univ2 fee to dev address\r\n uint256 liquidityFee = _amount.mul(gFees.liquidityFee).div(1000);\r\n TransferHelper.safeTransfer(_lpToken, devaddr, liquidityFee);\r\n uint256 amountLocked = _amount.sub(liquidityFee);\r\n \r\n userLock.amount = userLock.amount.add(amountLocked);\r\n \r\n emit onDeposit(_lpToken, msg.sender, amountLocked, userLock.lockDate, userLock.unlockDate);\r\n }\r\n \r\n /**\r\n * @notice split a lock into two seperate locks, useful when a lock is about to expire and youd like to relock a portion\r\n * and withdraw a smaller portion\r\n */\r\n function splitLock (address _lpToken, uint256 _index, uint256 _lockID, uint256 _amount) external payable nonReentrant {\r\n require(_amount \u003e 0, \u0027ZERO AMOUNT\u0027);\r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage userLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 userLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n \r\n require(msg.value == gFees.ethFee, \u0027FEE NOT MET\u0027);\r\n devaddr.transfer(gFees.ethFee);\r\n \r\n userLock.amount = userLock.amount.sub(_amount);\r\n \r\n TokenLock memory token_lock;\r\n token_lock.lockDate = userLock.lockDate;\r\n token_lock.amount = _amount;\r\n token_lock.initialAmount = _amount;\r\n token_lock.unlockDate = userLock.unlockDate;\r\n token_lock.lockID = tokenLocks[_lpToken].length;\r\n token_lock.owner = msg.sender;\r\n\r\n // record the lock for the univ2pair\r\n tokenLocks[_lpToken].push(token_lock);\r\n\r\n // record the lock for the user\r\n UserInfo storage user = users[msg.sender];\r\n uint256[] storage user_locks = user.locksForToken[_lpToken];\r\n user_locks.push(token_lock.lockID);\r\n }\r\n \r\n /**\r\n * @notice transfer a lock to a new owner, e.g. presale project -\u003e project owner\r\n */\r\n function transferLockOwnership (address _lpToken, uint256 _index, uint256 _lockID, address payable _newOwner) external {\r\n require(msg.sender != _newOwner, \u0027OWNER\u0027);\r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage transferredLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 transferredLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n \r\n // record the lock for the new Owner\r\n UserInfo storage user = users[_newOwner];\r\n user.lockedTokens.add(_lpToken);\r\n uint256[] storage user_locks = user.locksForToken[_lpToken];\r\n user_locks.push(transferredLock.lockID);\r\n \r\n // remove the lock from the old owner\r\n uint256[] storage userLocks = users[msg.sender].locksForToken[_lpToken];\r\n userLocks[_index] = userLocks[userLocks.length-1];\r\n userLocks.pop();\r\n if (userLocks.length == 0) {\r\n users[msg.sender].lockedTokens.remove(_lpToken);\r\n }\r\n transferredLock.owner = _newOwner;\r\n }\r\n \r\n /**\r\n * @notice migrates liquidity to uniswap v3\r\n */\r\n function migrate (address _lpToken, uint256 _index, uint256 _lockID, uint256 _amount) external nonReentrant {\r\n require(address(migrator) != address(0), \"NOT SET\");\r\n require(_amount \u003e 0, \u0027ZERO MIGRATION\u0027);\r\n \r\n uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];\r\n TokenLock storage userLock = tokenLocks[_lpToken][lockID];\r\n require(lockID == _lockID \u0026\u0026 userLock.owner == msg.sender, \u0027LOCK MISMATCH\u0027); // ensures correct lock is affected\r\n userLock.amount = userLock.amount.sub(_amount);\r\n \r\n // clean user storage\r\n if (userLock.amount == 0) {\r\n uint256[] storage userLocks = users[msg.sender].locksForToken[_lpToken];\r\n userLocks[_index] = userLocks[userLocks.length-1];\r\n userLocks.pop();\r\n if (userLocks.length == 0) {\r\n users[msg.sender].lockedTokens.remove(_lpToken);\r\n }\r\n }\r\n \r\n TransferHelper.safeApprove(_lpToken, address(migrator), _amount);\r\n migrator.migrate(_lpToken, _amount, userLock.unlockDate, msg.sender);\r\n }\r\n \r\n function getNumLocksForToken (address _lpToken) external view returns (uint256) {\r\n return tokenLocks[_lpToken].length;\r\n }\r\n \r\n function getNumLockedTokens () external view returns (uint256) {\r\n return lockedTokens.length();\r\n }\r\n \r\n function getLockedTokenAtIndex (uint256 _index) external view returns (address) {\r\n return lockedTokens.at(_index);\r\n }\r\n \r\n // user functions\r\n function getUserNumLockedTokens (address _user) external view returns (uint256) {\r\n UserInfo storage user = users[_user];\r\n return user.lockedTokens.length();\r\n }\r\n \r\n function getUserLockedTokenAtIndex (address _user, uint256 _index) external view returns (address) {\r\n UserInfo storage user = users[_user];\r\n return user.lockedTokens.at(_index);\r\n }\r\n \r\n function getUserNumLocksForToken (address _user, address _lpToken) external view returns (uint256) {\r\n UserInfo storage user = users[_user];\r\n return user.locksForToken[_lpToken].length;\r\n }\r\n \r\n function getUserLockForTokenAtIndex (address _user, address _lpToken, uint256 _index) external view \r\n returns (uint256, uint256, uint256, uint256, uint256, address) {\r\n uint256 lockID = users[_user].locksForToken[_lpToken][_index];\r\n TokenLock storage tokenLock = tokenLocks[_lpToken][lockID];\r\n return (tokenLock.lockDate, tokenLock.amount, tokenLock.initialAmount, tokenLock.unlockDate, tokenLock.lockID, tokenLock.owner);\r\n }\r\n \r\n // whitelist\r\n function getWhitelistedUsersLength () external view returns (uint256) {\r\n return feeWhitelist.length();\r\n }\r\n \r\n function getWhitelistedUserAtIndex (uint256 _index) external view returns (address) {\r\n return feeWhitelist.at(_index);\r\n }\r\n \r\n function getUserWhitelistStatus (address _user) external view returns (bool) {\r\n return feeWhitelist.contains(_user);\r\n }\r\n}"}}File 2 of 3: UniswapV2Pair
// File: contracts/interfaces/IUniswapV2Pair.sol
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
// File: contracts/interfaces/IUniswapV2ERC20.sol
pragma solidity >=0.5.0;
interface IUniswapV2ERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}
// File: contracts/libraries/SafeMath.sol
pragma solidity =0.5.16;
// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
library SafeMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, 'ds-math-add-overflow');
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, 'ds-math-sub-underflow');
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
}
}
// File: contracts/UniswapV2ERC20.sol
pragma solidity =0.5.16;
contract UniswapV2ERC20 is IUniswapV2ERC20 {
using SafeMath for uint;
string public constant name = 'Uniswap V2';
string public constant symbol = 'UNI-V2';
uint8 public constant decimals = 18;
uint public totalSupply;
mapping(address => uint) public balanceOf;
mapping(address => mapping(address => uint)) public allowance;
bytes32 public DOMAIN_SEPARATOR;
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint) public nonces;
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
constructor() public {
uint chainId;
assembly {
chainId := chainid
}
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
keccak256(bytes(name)),
keccak256(bytes('1')),
chainId,
address(this)
)
);
}
function _mint(address to, uint value) internal {
totalSupply = totalSupply.add(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(address(0), to, value);
}
function _burn(address from, uint value) internal {
balanceOf[from] = balanceOf[from].sub(value);
totalSupply = totalSupply.sub(value);
emit Transfer(from, address(0), value);
}
function _approve(address owner, address spender, uint value) private {
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
function _transfer(address from, address to, uint value) private {
balanceOf[from] = balanceOf[from].sub(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(from, to, value);
}
function approve(address spender, uint value) external returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
function transfer(address to, uint value) external returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint value) external returns (bool) {
if (allowance[from][msg.sender] != uint(-1)) {
allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
}
_transfer(from, to, value);
return true;
}
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
bytes32 digest = keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE');
_approve(owner, spender, value);
}
}
// File: contracts/libraries/Math.sol
pragma solidity =0.5.16;
// a library for performing various math operations
library Math {
function min(uint x, uint y) internal pure returns (uint z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint y) internal pure returns (uint z) {
if (y > 3) {
z = y;
uint x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}
// File: contracts/libraries/UQ112x112.sol
pragma solidity =0.5.16;
// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
// range: [0, 2**112 - 1]
// resolution: 1 / 2**112
library UQ112x112 {
uint224 constant Q112 = 2**112;
// encode a uint112 as a UQ112x112
function encode(uint112 y) internal pure returns (uint224 z) {
z = uint224(y) * Q112; // never overflows
}
// divide a UQ112x112 by a uint112, returning a UQ112x112
function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
z = x / uint224(y);
}
}
// File: contracts/interfaces/IERC20.sol
pragma solidity >=0.5.0;
interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
}
// File: contracts/interfaces/IUniswapV2Factory.sol
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
// File: contracts/interfaces/IUniswapV2Callee.sol
pragma solidity >=0.5.0;
interface IUniswapV2Callee {
function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}
// File: contracts/UniswapV2Pair.sol
pragma solidity =0.5.16;
contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
using SafeMath for uint;
using UQ112x112 for uint224;
uint public constant MINIMUM_LIQUIDITY = 10**3;
bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));
address public factory;
address public token0;
address public token1;
uint112 private reserve0; // uses single storage slot, accessible via getReserves
uint112 private reserve1; // uses single storage slot, accessible via getReserves
uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves
uint public price0CumulativeLast;
uint public price1CumulativeLast;
uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
uint private unlocked = 1;
modifier lock() {
require(unlocked == 1, 'UniswapV2: LOCKED');
unlocked = 0;
_;
unlocked = 1;
}
function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
_reserve0 = reserve0;
_reserve1 = reserve1;
_blockTimestampLast = blockTimestampLast;
}
function _safeTransfer(address token, address to, uint value) private {
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
}
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
constructor() public {
factory = msg.sender;
}
// called once by the factory at time of deployment
function initialize(address _token0, address _token1) external {
require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
token0 = _token0;
token1 = _token1;
}
// update reserves and, on the first call per block, price accumulators
function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
uint32 blockTimestamp = uint32(block.timestamp % 2**32);
uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
// * never overflows, and + overflow is desired
price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
}
reserve0 = uint112(balance0);
reserve1 = uint112(balance1);
blockTimestampLast = blockTimestamp;
emit Sync(reserve0, reserve1);
}
// if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
address feeTo = IUniswapV2Factory(factory).feeTo();
feeOn = feeTo != address(0);
uint _kLast = kLast; // gas savings
if (feeOn) {
if (_kLast != 0) {
uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
uint rootKLast = Math.sqrt(_kLast);
if (rootK > rootKLast) {
uint numerator = totalSupply.mul(rootK.sub(rootKLast));
uint denominator = rootK.mul(5).add(rootKLast);
uint liquidity = numerator / denominator;
if (liquidity > 0) _mint(feeTo, liquidity);
}
}
} else if (_kLast != 0) {
kLast = 0;
}
}
// this low-level function should be called from a contract which performs important safety checks
function mint(address to) external lock returns (uint liquidity) {
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
uint balance0 = IERC20(token0).balanceOf(address(this));
uint balance1 = IERC20(token1).balanceOf(address(this));
uint amount0 = balance0.sub(_reserve0);
uint amount1 = balance1.sub(_reserve1);
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
if (_totalSupply == 0) {
liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
_mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
} else {
liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
}
require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
_mint(to, liquidity);
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
emit Mint(msg.sender, amount0, amount1);
}
// this low-level function should be called from a contract which performs important safety checks
function burn(address to) external lock returns (uint amount0, uint amount1) {
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
uint balance0 = IERC20(_token0).balanceOf(address(this));
uint balance1 = IERC20(_token1).balanceOf(address(this));
uint liquidity = balanceOf[address(this)];
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
_burn(address(this), liquidity);
_safeTransfer(_token0, to, amount0);
_safeTransfer(_token1, to, amount1);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
emit Burn(msg.sender, amount0, amount1, to);
}
// this low-level function should be called from a contract which performs important safety checks
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');
uint balance0;
uint balance1;
{ // scope for _token{0,1}, avoids stack too deep errors
address _token0 = token0;
address _token1 = token1;
require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
}
uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
{ // scope for reserve{0,1}Adjusted, avoids stack too deep errors
uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
}
_update(balance0, balance1, _reserve0, _reserve1);
emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
}
// force balances to match reserves
function skim(address to) external lock {
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
_safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
_safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
}
// force reserves to match balances
function sync() external lock {
_update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
}
}File 3 of 3: UniswapV2Factory
pragma solidity =0.5.16;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
interface IUniswapV2ERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}
interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
}
interface IUniswapV2Callee {
function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}
contract UniswapV2ERC20 is IUniswapV2ERC20 {
using SafeMath for uint;
string public constant name = 'Uniswap V2';
string public constant symbol = 'UNI-V2';
uint8 public constant decimals = 18;
uint public totalSupply;
mapping(address => uint) public balanceOf;
mapping(address => mapping(address => uint)) public allowance;
bytes32 public DOMAIN_SEPARATOR;
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint) public nonces;
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
constructor() public {
uint chainId;
assembly {
chainId := chainid
}
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
keccak256(bytes(name)),
keccak256(bytes('1')),
chainId,
address(this)
)
);
}
function _mint(address to, uint value) internal {
totalSupply = totalSupply.add(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(address(0), to, value);
}
function _burn(address from, uint value) internal {
balanceOf[from] = balanceOf[from].sub(value);
totalSupply = totalSupply.sub(value);
emit Transfer(from, address(0), value);
}
function _approve(address owner, address spender, uint value) private {
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
function _transfer(address from, address to, uint value) private {
balanceOf[from] = balanceOf[from].sub(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(from, to, value);
}
function approve(address spender, uint value) external returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
function transfer(address to, uint value) external returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint value) external returns (bool) {
if (allowance[from][msg.sender] != uint(-1)) {
allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
}
_transfer(from, to, value);
return true;
}
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
bytes32 digest = keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE');
_approve(owner, spender, value);
}
}
contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
using SafeMath for uint;
using UQ112x112 for uint224;
uint public constant MINIMUM_LIQUIDITY = 10**3;
bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));
address public factory;
address public token0;
address public token1;
uint112 private reserve0; // uses single storage slot, accessible via getReserves
uint112 private reserve1; // uses single storage slot, accessible via getReserves
uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves
uint public price0CumulativeLast;
uint public price1CumulativeLast;
uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
uint private unlocked = 1;
modifier lock() {
require(unlocked == 1, 'UniswapV2: LOCKED');
unlocked = 0;
_;
unlocked = 1;
}
function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
_reserve0 = reserve0;
_reserve1 = reserve1;
_blockTimestampLast = blockTimestampLast;
}
function _safeTransfer(address token, address to, uint value) private {
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
}
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
constructor() public {
factory = msg.sender;
}
// called once by the factory at time of deployment
function initialize(address _token0, address _token1) external {
require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
token0 = _token0;
token1 = _token1;
}
// update reserves and, on the first call per block, price accumulators
function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
uint32 blockTimestamp = uint32(block.timestamp % 2**32);
uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
// * never overflows, and + overflow is desired
price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
}
reserve0 = uint112(balance0);
reserve1 = uint112(balance1);
blockTimestampLast = blockTimestamp;
emit Sync(reserve0, reserve1);
}
// if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
address feeTo = IUniswapV2Factory(factory).feeTo();
feeOn = feeTo != address(0);
uint _kLast = kLast; // gas savings
if (feeOn) {
if (_kLast != 0) {
uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
uint rootKLast = Math.sqrt(_kLast);
if (rootK > rootKLast) {
uint numerator = totalSupply.mul(rootK.sub(rootKLast));
uint denominator = rootK.mul(5).add(rootKLast);
uint liquidity = numerator / denominator;
if (liquidity > 0) _mint(feeTo, liquidity);
}
}
} else if (_kLast != 0) {
kLast = 0;
}
}
// this low-level function should be called from a contract which performs important safety checks
function mint(address to) external lock returns (uint liquidity) {
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
uint balance0 = IERC20(token0).balanceOf(address(this));
uint balance1 = IERC20(token1).balanceOf(address(this));
uint amount0 = balance0.sub(_reserve0);
uint amount1 = balance1.sub(_reserve1);
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
if (_totalSupply == 0) {
liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
_mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
} else {
liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
}
require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
_mint(to, liquidity);
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
emit Mint(msg.sender, amount0, amount1);
}
// this low-level function should be called from a contract which performs important safety checks
function burn(address to) external lock returns (uint amount0, uint amount1) {
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
uint balance0 = IERC20(_token0).balanceOf(address(this));
uint balance1 = IERC20(_token1).balanceOf(address(this));
uint liquidity = balanceOf[address(this)];
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
_burn(address(this), liquidity);
_safeTransfer(_token0, to, amount0);
_safeTransfer(_token1, to, amount1);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
emit Burn(msg.sender, amount0, amount1, to);
}
// this low-level function should be called from a contract which performs important safety checks
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');
uint balance0;
uint balance1;
{ // scope for _token{0,1}, avoids stack too deep errors
address _token0 = token0;
address _token1 = token1;
require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
}
uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
{ // scope for reserve{0,1}Adjusted, avoids stack too deep errors
uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
}
_update(balance0, balance1, _reserve0, _reserve1);
emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
}
// force balances to match reserves
function skim(address to) external lock {
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
_safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
_safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
}
// force reserves to match balances
function sync() external lock {
_update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
}
}
contract UniswapV2Factory is IUniswapV2Factory {
address public feeTo;
address public feeToSetter;
mapping(address => mapping(address => address)) public getPair;
address[] public allPairs;
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
constructor(address _feeToSetter) public {
feeToSetter = _feeToSetter;
}
function allPairsLength() external view returns (uint) {
return allPairs.length;
}
function createPair(address tokenA, address tokenB) external returns (address pair) {
require(tokenA != tokenB, 'UniswapV2: IDENTICAL_ADDRESSES');
(address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
require(token0 != address(0), 'UniswapV2: ZERO_ADDRESS');
require(getPair[token0][token1] == address(0), 'UniswapV2: PAIR_EXISTS'); // single check is sufficient
bytes memory bytecode = type(UniswapV2Pair).creationCode;
bytes32 salt = keccak256(abi.encodePacked(token0, token1));
assembly {
pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
}
IUniswapV2Pair(pair).initialize(token0, token1);
getPair[token0][token1] = pair;
getPair[token1][token0] = pair; // populate mapping in the reverse direction
allPairs.push(pair);
emit PairCreated(token0, token1, pair, allPairs.length);
}
function setFeeTo(address _feeTo) external {
require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
feeTo = _feeTo;
}
function setFeeToSetter(address _feeToSetter) external {
require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
feeToSetter = _feeToSetter;
}
}
// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
library SafeMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, 'ds-math-add-overflow');
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, 'ds-math-sub-underflow');
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
}
}
// a library for performing various math operations
library Math {
function min(uint x, uint y) internal pure returns (uint z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint y) internal pure returns (uint z) {
if (y > 3) {
z = y;
uint x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}
// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
// range: [0, 2**112 - 1]
// resolution: 1 / 2**112
library UQ112x112 {
uint224 constant Q112 = 2**112;
// encode a uint112 as a UQ112x112
function encode(uint112 y) internal pure returns (uint224 z) {
z = uint224(y) * Q112; // never overflows
}
// divide a UQ112x112 by a uint112, returning a UQ112x112
function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
z = x / uint224(y);
}
}